Pump



Dec'. l 1942.,

PUMP

w Ziff Y 4/1 46 I L zz 2 Shets-Sheet l ATTORNEY.

substantially along the lines 2-2 Patented Dec. l, 1942 i UNITED STATES PATENT oFFl-'ca PUMP Ralph Wiken, Milwaukee, Wis., assigner to The Falk Corporation, Milwaukee, Wis., `a corporation of Wisconsin Application August 3,

This invention relates to pumps and particularly to further improvements in pumps of the type disclosed in -my' copending application, Serial No. 229,438, filed September 12, i938.

The pump disclosed in said application com- -'prises a reciprocating chamber-formingk member and a rotating liquid conducting member traversing the same andprovided with ports for controlling the admission and discharge of liquid to `and iromthe pump chamber. In pumps oi' that type, it is diiiicult to prevent bybpassing oi' liquid through the ports from one end of the chamber to the other.

One object of the present inventionis to overcome this difiiculty. This I have accomplished by a novel arrangement which prevents communica- 'z tion of either port with either end of the chamber until communication thereof with the other end ofthechamberhasbeenbiocked,

Another object is tofurther improve the censtruction and operations of pumps oi this type.

.Other more' speciilc objects-and advantages will appear from the following description o i an illustrative embodiment of the presmt invention. Inthe accompanying dra wings: Figure 1 is a vertical sectional view through a pump constructed in accordance with thepresent invention.

Figs. 2 and 3 are horizontal sectional views taken and 2 8. respectively of Figi 1. l

Fig. i is a vertical sectional view taken substantially at right angles to that of Fig. 1.

Fig. 5 is a'longitudinalsectional view of the pump impeller with the pintle and bearing sleeve removed.

138.6 is an enlarged sectional view takenalong pump is'drlven. The pump is conned between an' appropriate shaft bearing I3 seated in the upper end of the hub Il'and a dished closure plaie Il removably attached to bottom of the hub, preftion in a horizontal bore I1 formed in a stationary blocklttedinthehubli.' Averticalopening- I2 extending through the impeller It is closed at 1940,- serm No. 35am 's claims. (121.1034158) bore I1 to form a pump chamber. This chamber is traversed by a vertical sleeve 20 closely fitted for latter, and the sleeve 20 makes contact with the side walls of the openinglso as to'divide the pump chamber into separate end compartments which expand and contract as the impeller I8 reciprocates with respect to the sleeve 2li.

The sleeve 20 extends upwardly from an eccentric disk 22, rotatable therewith and confined between the bottom of the block IB and a non-rotating plate '23 seated upon the lower closure plate M The plate 23 is releasablv attached to the block I8 by appropriate means. such as bolts 24, which extend upwardlv therethrough and through spacer sleeves 25 and into the block I8. The disk 22 is freely rotatable within an encircling ring 28 which carries a vertical pin 21 that extends through a slot 2l in the block I2 into driving en-f gagement with the impeller Ii. The arrangement is suchl that lengthwise reciprocation of the impeller-is effected by rotation of the sleeve 2l and eccentric disk 22.

The sleeve 20 and disk 22 are rotated from the shaft I2 through a pintle 29 constituting an exshoulders 2l alternatively engageable with the end of an inwardly projecting pin 32 in the disk 22 to drive the latter. vOrne of the shoulders 3| coacts with the pin 32 to drive the disk in one direction and the other in the other direction. theshoulders II being so spaced-relatively to each other as to permit the pintle to turn through an angle of one hundred eighty-degrees relative to the sleeve 2l and disk 22 whenever the direction of rotation of the shaft I2 is reversed. This idle motion between pintle .and disk is provided for a purpose which will hereinafter appear.

Oil enters the pump from the surrounding reservoir in the casing I0 through ports 33 in the wall of thehub I0, and thence through arcuate recesses 34 in the sides' of the block I8, through vertical ports 35 in the same block, through the I space surrounding the disk 22 and ring 26, and through the open ends of a slot 38 in the plate 23 to a-duct l1 in the lower end of the pintle Y 28. The duct`21'communicates with a. lower port I9 in the sleeve 2li whenthe shaft is driven clockwise (Figs. 3 and 6) or with a second lower its top and bottom by the surrolmding wallof-the port 40 in the sleeve 2l when the shaft is driven in the opposite direction. The pump discharges through a duct Il in the drive shaft I2, this ductl communicating with a duct 42 in the upper end of the pintle 2.9. Duct 42 communicates with an upper port 44 in the sleeve when the shaft is driven clockwise and with a second upper port l in the sleeve when the shaft is driven reversely. The arrangement is such that when the shaft I2, pintle 29, and sleeve 20 are rotating clockwise, asa unit, the lower pintle duct 21 communicates through the port 39 with the left end of the pump chamber during movement of the impeller I8 toward the left and with the right end of the chamber during movement of the impeller toward the right, and the upper pintle duct 4I communicates through the port M with the right end of the chamber during movement.

of the impeller toward the left and with the left end of the chamber during movement of the impeller toward the right.

'Ihe pump, fashioned and assembled as above described,foperates in the following manner: With rotation of shaft I2 in a particular direction. for vexample clockwise in Figs. 2 and3, shoul- .der 3| bears against pin 22 to thereby induce rotation of eccentric 22 and sleeve 20 with shaft l2. Ring 28 surrounding eccentric 22 swings about pin 21 so asto move freely in a direction transverse to channel I1, but vis constrained to move bodily longitudinally of channel I1 together with pin 21. Rotary motion of cam 22 is thereby translated into reciprocatory motion of pin' 21 forth lengthwise within channel I1. Since ro tary shaft 28 and sleeve 2l completely span opening Il in impeller I6, they divide opening I9 into segregated end chambers, which increase and decrease in size with reciprocation of impeller I6,

-so as to secure a pumping action against the rotary members. At the same time, rotation of the latter presents inlet and outlet ports 2l and I alternately to the opposite ends of the pump chamber, so that-with contraction of the segregated space at one end of the chamber, oil will be forced through the outlet port 4I! andduct 42, while at the same timethe expanding opposite end of the chamber will be drawing oil through inlet port 3,8 and duct 21. r o

Provision is made for preventing communication of either duct'with either end of the pump chamber until after communication thereof with the other end of the chamber has been broken'. This is accomplished by blocking .all of the ports at the instant the impeller reaches either end of its stroke. In the pump shown, the interior surfaces oi. the openings 2l in which the sleeve- 22 is iournalled are utilized for this. purpose.` In

this conncctionit will be noted, particularly froml Fig. 5, that by Areason .of the intersection of these vertical cylindrical openings 2iA with the` horimonta] .cylindrical borev I1 in which the impeller *i IB reciprocates, the internal surfaces of those openings 2| at the opposite sides of the bore l1 extend inwardly beyond the upper and lower ex tremities of the bore; and as indicated particularly in Figs. 4.5 and 6, the upper ports Il and Il in the sleeve 2l are so disposed and shaped as to be completely coveredby the extended surfaces of the upper opening 2| and the lower ports 29 and 4I are similarly disposed and shaped so asA to be completely 'covered by the extended surfaces of the lower opening 2|, at each instant that the impeller i0 reaches an end cf its stroke.

The inwardly extended surfaces of the upper' Nid lwefopenihl 2i thu# form im@ had! and thus of impeller I8, which is moved back and which. during rotation of the pintle 20 andsleevel 20, momentarily but completely block communication between each pintle duct 4I and- 21 and the ends of the pump chamber, and thus eil'ectively prevent communication of either duct with either end of the pump chamber until communication with the other end of the chamber has been blocked.

As in the pump described in the application above identided, both ends of the vbore l1 are preferably maintained flooded with oil received from the surrounding reservoir through ducts Il vextending through `thewall of the hub I0.

It will be noted that the pump herein shown, including the block I8 and plate 23 may be removed, as a unit, with the shaft I2, upwardly from the hollow hub III for ready inspection and repair, and that after'removing the lower closure plate I4 the pump mayY with equal facility be withdrawn, as a unit, downwardly from the hollow hubl I0.

. each disposed izo-,communicate with the opposite ends'of said chamber alternately during rotation of said rotonand means coactlng with said ports for preventing simultaneous communication of either of said ports with both ends of said chamber.

2. In a pump'the'combination of means form-v 1 ing a reciprocating pump chamber, means spanning said chamber and restrained against recip`' rocation therewith to thereby eect a pumping action, said last named means including a rotor penetrating said chamber and rotatable about an axis disposed transversely of said chamber, said rotor having inlet and outlet ports in the periphery thereof each'dispcsed tov communicate with the opposite ends of said chamber alternately during successive strokes of said chamber, and

means providing arcuate surfaces for sealing said ports at the end of eachstroke of said chamber.

3. In a pump the combination of means forming a reciprocating pump chamber, means span ning said chamber and restrained against recip- 'rocation therewith to thereby effect a pumping l action, said last named means including a rotor separating the ends of said chamber and rotat able about an axis disposed transversely` of said chamber, said rotor having inlet and outlet ports each disposed to communicate with the opposite .ends of said chamber alternatelyl during successivestrokes of .said chamber, and centering means for said rotor, said centering means having surfaces disposed to'seal said ports at the end of each stroke of said chamber.

4. In a pump the combination of means forming a pump chamber, a member separating the ends of said chamber, and operating connections for effecting relative rotation and reciprocation between said member and means, said rotation i being about an axis transverse tothe direction of reciprocation, said member having inlet and outlet ports each disposed to communicate with the opposite ends of said chamber alternately during mccessive reciprocations. and means for closing 1. In a pump the combination of means formsaid ports at the end of each reciprocating stroke.

5. In a pump the combination of a block, an element reciprocable in said block and having an opening therein closed by said block to form a pump chamber, a rotor traversing said opening to thereby'separate the ends oi said chamber, said rotor being restrained against reciprocation with said element to thereby eiect a pumping action, said rotor having inlet and outlet ports each disposed to communicate with the opposite ends of said chamber alternately in timed relation with reciprocation thereof, said block having an opening in which said rotor is journalled, and said last namedopening being bounded by surfaces positioned to seal said ports as said element reaches the end of each reciprocating stroke.

6. In a pump the combination of a body portion having a cylindrical channel therein, a cylindricai element iltted to reciprocate lengthwise of said channel and having an axially extended opening therein cooperating with said channel to form a chamber, said body portion having a second cylindrical channel intersecting said first named channel, and arotor journalled in said second channel and disposed to separate the ends of said chamber, said rotor being connected to operate in timed relation with said element and having inlet and outlet ports each adapted to communicate with the separated ends oi' said chamber alternately during reciprocation of said element, and said ports being disposed to cross and recross the line of intersection between said channels during rotation of said rotor whereby said ports are momentarily closed by the walls oi' said second channel at each end of the strokes of said member.

RAIPH WIKEN. 

